Ullagon (5e Creature)
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Large construct, neutral
Damage Resistances acid, cold, fire, lightning
Magic Weapons. The ullagon's weapon attacks are magical.
Multiattack. The ullagon makes four attacks: one with its bite, two with its claws, and one with its tail.
Bite. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 18 (2d10 + 7) piercing damage and 14 (4d6) psychic damage. If the ullagon scores a critical hit against a creature, the target must succeed on a DC 17 Intelligence saving throw or be stunned for 1 minute. An affected creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
Claw. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 16 (2d8 + 7) slashing damage and 14 (4d6) psychic damage.
Tail. Melee Weapon Attack: +14 to hit, reach 15 ft., one target. Hit: 20 (2d12 + 7) bludgeoning damage and 14 (4d6) psychic damage. If the target is a creature, it must succeed on a DC 22 Strength saving throw or be knocked prone.
Extract Brain (Recharge 5-6). Melee Weapon Attack: +14 to hit, reach 5 ft., one prone humanoid. Hit: The target takes 55 (10d10) piercing damage. If this damage reduces the target to 0 hit points, the ullagon kills the target by extracting its brain and storing the brain inside itself. The ullagon can store no more than six brains in this way at once.
Ullagons are bizarre constructs whose lithe yet powerful bodies are made from gleaming blue-green metal crisscrossed with veins of white light. This unearthly metal conducts psionic energy, causing its already deadly strikes to cause intense mental pain as their targets' thoughts are drained out of them, which the ullagon can view at any time.
Otherworldly Origins. While the exact origins of ullagons are unknown, it is speculated that whatever entity manufactures them resides within the Far Realm, a place of extraplanar madness inhabited by unspeakable horrors. While most ullagons operate independently, a few have been found alongside aberrations, particularly mind flayers. The brains extracted by an ullagon can be consumed by illithids, but there is no evidence that they can create or even control these constructs.
Constructed Nature. An ullagon doesn't require air, food, drink, or sleep.